Improved ice-cream freezer



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THOMAS MILLS AND GEORGE ill. HILLS,

' VANIA.

0F PHILADELPHIA, PENNSYL- Lette'rs .Patent No. 100,918, dated March 15, 1870 IMPROVED ICE-CREAM PREEZER.

The Schedule referred to :in these Letters Patent and making part ofthe same We, THOMAS MrLLs and GEORGE M. Mi-LLs, both of the city of Philadelphia, and State of Pennsylvania, have invented certain Improvements in Ice-Cream Freezers, of which the following is a specification.

The rst partof our invention relates to a novel arrangement of couplings for connecting the driving power, to the can and dasher, which system of couplings permits an easy attachment or release of these parts, and allows the tub containing thc canI and snrrounding freezing-mixture to be put in place or removed without taking o any part of the framing or machinery, thus avoiding the annoyance and delay often due to loss or mislaying of' detached parts of the machinery, and saving time in the actual operation of connecting and disconnecting the driving a means of varying the speed of the vertical shaft relative to the first driving-shaft. By running the dasher and can at a higher speed during the last partof the freezing operation the ice-cream is greatly iniproved in quality and swelled in bulk, and in order to accomplish this without increased exertion on the part of the operator, an easily transposed system of changegears is provided, which gives, in addition to the ordinary speed, the required increased velocity to the vertical shaft from a uniform speed of crank.

Description of the Accompanying Dran-ings.

Figure 1 is a side elevation of a machine embodying our invention, and partly drawn in section.

Figure 2 is a view of the vertical shaft and clutches in their detached position.

. Figure 3 is an end view of the change-gearing.

Figure 4 is a plan of the frame, swivel bearing, and change-gearing. t A

Figure 5 is a detached view of the shifter for the change-gearing.

The framing of the machine consists of an iron hase, A, uprigbts B B', and cross-giri; C, the latter carrying the various partsof the driving-machinery.

The cream-can'D has a pivot, a, at its lower end, resting andtnrningin a socket in the bottom of tub F, which contains the freezing-mixture srn'roumling vthe can D in the usual manner.

Revolving motion in opposite directions is imparted to the can I) and dasher F by the usual train of bevelwheels b c c', but between this gearing and the can and the dasher intervenes a pecnliarly-constructed system of clutch-couplings, arranged as follows:

The lid d of can D is provided with a square shank, c,'throngh which passes the upper end of the-dasherspindle j'.

The bevel wheel c, giving motion to-the can I), has a long downward-extending sleeve, g, and this carries on its inside a long sliding sleeve-piece, h. The lower end of this piece forms a square socket, which tits the shank c, and acts as a carrier for revolving the can D.

The sleeve h has a pin, t, confined in a long vertical slot, j. It is thus driven by the hub g, and may be elevated or lowered within the saine, to the extent ot the length of said slot.

This has lateral recesses at each end, (sce fig. 2,) into which the pin 'i may enter, and th'ns` hold the sleeve h in either the connected or disconnected position.

The shaft f of the upper bevel-pinion c' passes through the hub of c and through sleeve h, and its lower end is provided with a transverse slot, 7., into which tits a correspondingly-tiattencd end of the dasher-shaft f. The dasher is thus driven by the shaft j", which, being at its lower end conlned within 7i', retains its hold nponf as long as h remains in its lower coupled position.

G is a handle, hinged to the wheel-frame H at l, and serving to elevate the shaft f', for uncoupling the same from the dasher-spindlef. The swivel bearing for the vertical shaft consists of two rings, m and n, placed one within the other, and each provided with a pair of pivots. Those on ring m have their bearings in suitable pockets provided in thei-ame-girt C, while the pivots on n restin notches provided in m at right angles to its pivots. A u-ni- -versal joint is thus formed, which permits the hub It of wheel c, resting on u, to bev deflected from a true perpendicular line. in any direction without bringing any injurious strain oh the hearings.

The change-gearing for varying the speed of the cream-can and dashcr relative to that ofthe crankshaft, is arranged as follows:

The horizontal shaft b, carrying the bevel-wheel l1, has at its outer end two spur-wheels, I J, cast in one, of suitable varied diameters, and parallel with this` shaftis placed the trst driving-shaft K.

This is provided with a pair of spur-wheels, L M, of such relative diameters as to gear respectively with the Inst-mentioned wheels I J, but separated lengthwise upon their axis in such a manner` that only one of the two wheels can gear with its mat-e at a time.

The hub of wheels L M is splined on the shaft K, and has a lengthwise motion on this shaft, in which motion itis so actuated and controlled by a shifting arm, o, that either one ofthe wheels L M may be thrown into gear with its respective mate on shaft b, by placing the handle p in therequired one of two positions shown in full and dotted lines in Iig. 5, this handle p being so placed as to hold the arm o securely in either position, by its overhanging weight bearing against the outward-projecting end of 0.

The diameters of the two pairs of wheels L I and M J are relatively so arranged that, while the former pair gives a sntiieiently rapid rotation to the can and dasher for the first part of the freezing operation with a moderate speed of the crank-shaft, the other pair of wheels, `J M, will, without increased crank-speed, increase the speed of the can and dasher,y as required, for a perfect finishing of the freezing operation.

Having thus described the nature and objects of our improvements, we do not broadly claim as new a clutch or coupling for connecting the rotative power to the creamfcan or dasher; but f We claim as our inventionclutching-shaft f', when arranged relative to and operating in combination with the yslotted hub g of bevei- -wheel c, can D, and dasher F, substantially in the manner and forthe purpose set forth.

2. In combination with bevel-wheel c and sleevecoupling h, the swivel bearing ml n, operating substantially as and for the purpose described.

3. In combination with the driving-shaft K, intermediate shaft b, bevel-gears b c c', upright shaft f', can D, and dasher F, and thedescribed change-gears L I and M J, when operating in the manner shown and described.

4. In combination with the sliding change-gears L and M, the shifter-arm o,` and locking-handle p, arranged as and for the purpose set forth.

THOMAS MILLS GEO. M. MILLS. Witnesses:

THEoDoRE -BURGNER, EDWARD M. HENRY.

1. The vertically-sliding coupling-sleeve h and' 

